Impression-sheet for making stereotype-plates



UNITED STATES PATENT OFFICE,

CHARLES/A. SKENE, OF VVESTMORELAND, KANSAS.

iMPRESSlON-SHEET FOR MAKING STEREOTYPE-PLATES.

PECIPICATION forming part of Letters Patent No. 320,713, dated June 23, 1885.

Application filed February 23, 1884. (No specimens.)

To all whom, it may concern.-

Be it known that I, CHARLES A. SKENE, of \Vestmoreland, in the county of Pottawatomic and State of Kansas, have invented certain new and useful Improvements in Impression-Sheets for Making Stereotypellates, and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it.

My invention relates to an improvement in matrices for stereotype-plates; and it consists in a paper impressionsheet that is prepared by coating blotting'or other soft paper with a mixture that is composed of glycerine and plumbago, for the purpose to be more fully set forth hereinafter.

The object of my invention is to enable me to obtain stereotype-plates for printing purposes direct from matrices made by telegraph or type-writing machines, and thus to obviate the necessity of having to prepare type forms in order to obtain a cast, thus saving the time, labor, and expense of composition, distribution, and making up that are now necessary prerequisites to the operation.

In order to carry my process into operation, I take a sheet of blotting or other soft paper, of suitable size and thickness, and coat it evenly on both sides with a brush that is dipped into a mixture of glyeerine and plumbago. To make this preparation, plumbago is finely ground in a mortar, and a sufficient quantity of glycerine mixed with it to form a thin paste. When the paper has thoroughly absorbed the mixture, it is passed between heated rollers until its surfaces have become perfectly smooth. The paper so prepared is placed in a type-writing machine of any of the common forms, and the writing proceeded with as upon ordinary paper. The types will make impressions in the paper sufficiently deep to form a mold or matrix in which a stereotype-plate can be cast in the ordinary manner for use in an ordinary printing-press.

I am thus enabled to prepare stereotype plates for printing purposes without the necessity of having to prepare type-forms, thus effecting a saving of time, labor, and expense to a degree that has been heretofore unknown. It will be obvious that a telegraph printingniaehine may be thus employed in preparing the mold or matrix, and operated from a dis tant point, which will be found of great practical utility.

After the impression is taken upon the prepared paper it is dried as much as possible before stereotyping.

Having thus described my invention, I claim An impression sheet for forming a matrix or mold for stereotype-plates, that is composed of soft blotting-paper or other fibrous substance impregnated with a mixture of glycerine and plumbago, substantially as described.

In testimony whereof Iaflix my signaturein presence of two witnesses.

CHARLES A. SKENE.

\Vit nesses:

G. E. Rosa, IV. S. ANDERSON. 

